In our environment we build bunch of kernel packages and we want to keep them available (tagged) as long as there are some users of it. We achieve that by having separate tag protected which denies untagging the build from any other tags as long as it is part of protected one.

However, with koji-gc it is impossible to skip such builds as specifying tag protected :: skip will skip it only from untagging builds from protected tag.

I can imagine something like hastag protected :: skip which would skip such builds and exclude them from ordering rules.

If you have some other suggestion as well, let me know :)